Journal of Organometallic Chemistry p. 29 - 38 (1989)
Update date:2022-08-17
Topics:
Kamienska-Trela, K.
Kania, L.
Sitkowski, J.
Bednarek, E.
Some trans- and cis-1-trialkylsilyl-1,2-dihalogenoethenes have been synthesized and their 13C and 1H NMR spectra recorded.The compounds studied readily undergo reversible cis-trans isomerization, the cis isomers being thermodynamically more stable than the trans isomers.The value of 3J(SiHα)trans is about twice as large as that of 3J(SiHα)cis, and the values of 2J(CβHα)trans is about one-tenth that of 2J(CβHα)cis and this allows ready assignment of the configuration.The one-bond spin-spin coupling constants between the ethylenic carbons depend on the electronegativities of the substituents, trans 1J(C=C) in most cases being larger than 1J(C=C)cis.
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